Means for producing acid liquor in sulphite pulp processes



Feb. 2 1926. 157L271 J. DMJENSSEN MEANS FOR PRODUCING ACID LIQUOR INSULPHITE PULP PROQBSSES Filed Feb. 24', 1925 omssnck MIXING- Illyveryfor. l M j I w Patented Feb. 2, 1926.

UNITED. stares iPA't'hlhlT @FHQEQ moon m nus Jnnssnu, or NEW Yosn N. Y.,ASSIGNOB To a. n. JENSSENCOMPANY,

or NEW YORK, n. Y.

MEANS-FOR PRODUCING ACID LIQUOR IN SULPHITE PULP rnocnssns.

Application'filed February 24, 1925.

To all who m it may concern.

Be it known that 1, JACOB Danun Junssnn,

nate thenecessity of heating the water used in the production of theacid liquor during :the colder months of the year, when the temperatureof the water is so low as to materially retard the reaction incidentalto the making of the liquor :to utilize the waste heat generated in theoperation ofcooking innthe sulphite pulp process and distribute [thesame tout-he best advantage; to effect economy in the consumption offuel as well as labor attention and maintenance required in heating thewater for the acid liquor tanks: to increase the ellicicncy ofthcsulphite i pulp processes by improving the quality of the liquor used:and generally to provide inthe pulp industry a reduced cost ofproducticnand a uniform qualit of the outputpand' it consistsessentially of any 'lllGfillS employed for-the transference of therelief from a pulp digester to the towers.

acid liquor The drawingis a diagrammatic view showing the towers andreceptacles insection'.

, Itis well known i-sulphite made fI'O11'1- SO gases, water-andlimestone.

Theusual process is carried out in towers containing; broken limestonethrough which water tricklesabsorblng the E50 gases rising from thebottom and collecting and absorbing a line base which is commonly Thewater to effectively permit the reaction must not be chilled: else thecombining of the elements is so slow as to effect the quality of theliquor, therefore it is customary in approximately seven months of theyear to heat the water used.

The heating of the water specially for the acid liquor process is anadditional step as well as a considerable drain on, the hog Serial No.11,338.

water resources and besides there is alack of uniformity in thetemperatures that is not by any means conducive to the best results. a

The present invention utilizes the heat from the digrester 10 inbringing the 'temperature of the -*alcr in the acid liquor up to thedesired degree of heat.

The relief pipe 11 from the exhaust outlot 12 of the digester 10 leadsto the rcclaiming tank. 1? and extends downvmrdly thercinto andcommunicates with and sup ports the distributing; nozzle l t having manyjet orifices 15 and adapted to distribute the acid'laden fluid in saidtank. A cooler 16 connected by the pipes. 1? and 18' with the pipe 11intermediate of its length for use, when it is desirable in warmerWeather to cool the reclaimed acid liquor and for this purpose the valve19 is introduced in the pipe line 11 between the connections to thepipes 17 and 18, therefore when the valve 19 is turned to the openposition, the cooler is cut out from the operation and its ownconnection is cut off by the valves 2(land in the pipes 17 andj18; 1 a iThe acid liquor making towers 22 andQi-i are respectively the primarvandsecondary towers known in the trade as weak, and

strong towers and the acid liquoris made in these towers its-generallydescribed herenr before by the process well known in the art, though forthe purpose of clearly explaining this invention a one way system isshown,

whereas the towers are generally reversible, but this does not alter themain feature of that theacid liquor used forudigestingvpurposes is anacid solution "10f calciummagnesium:

the leadcoolers of the sulphur burning plant and enters the tower 22'and 24 and trickles down through the limestone therein gatherin; thefrom the sulphur burning plant pressedinto the tower by a fan.

The acid liquor resulting from flows from the outlet 25 at the lower endof the tower 22 into the pipe 26, which leads to the mixing box 27.

This mixing the reclaiming tank 13 by the pipe 28, therefore the warmacid liquor flows through the pipe 28 and mixes with the cold acidpliquor flowing into said box 27 through the pipe 2.

The inlet of the pump 29 is connected to the outlet 30 of the mixing box27 by the this step box 27 is also connected to pipe 3t and the outletof the pump is connected by the pipe 32 to the upper end of the tower 23and this pump 29 forces the moderated mixtures from the mixing box 27into said tower 23 to trickle down through the limestone and gather thegases rising from the inlet 33 which is connected to the sulphur burningplant. The exhaust gas from the tower 23 is conveyed through the pipe 3%from the upper end ofsaid tower "23-t-o the lower end of the tower 22for absorption into the fresh water.

The pump ,5 is connected to the lower end of the tower 23 by the pipe 36and to the reclaiming tank 13 by the pipe 37 and the liquor forcedthereby from the tower 23 into the reclainiingtank 13, to bestrengthened by the relief gases from the digester 10, asiouly acomparatively small portion of tle contents of said tank 13 is used forwarming the acid liquor in process of the making.

The finisher. acid liquor is drawn oil from the reclaiming to thestorage tank 38 or distributed direct to the digesters as foundconvenient and desirable.

It will now be seen that by the diversion of the weak acid liquor fromits tower to the mixing chamber before reaching the finished tower thetemperature of the liquor is moderated, consequently the liquortrickling through the limestone of the second tower readily gathers thelime base and quick reaction occurs due to the moderate tempera tureswhereby the process is not retarded. In place or thisdiappening thetemperature of the weakliquor is so regulated that the absorption andchemical union is encoura 'ed and an atlinity established such as wouldoccur under natural conditions during warmer weather conditions when theelements of nature unite under more or less even. tempe atures.

hat I claim is:

l. A means for producing acid liquor in sulphite pulp processescomprising a primary tower for the preliminary step and secondary towerfor further treatment, and

a mixer for heating the liquor in passage from tic primary tower to thesecondary for the aforesaidfurther treatment.

2. In means for producing acid liquor in sulphite pulp processes, weakand strong liquor towers, a digester, a reclaiming tank connected to theexhaust from said digester, a mixing box forming an intermediary memberbetween said weak liquor tower-and said reclaiming tank on the one handand said strong liquor tower and said reclaiming tank on the other hand,means for forcing the heated mixture from said mixing box to said strongliquor tower, and means for drawing the liquor from said strong liquortower to said reclaiming tank.

3. In means for producing acid liquor in sulphite pulp processes, weakand strong liquor towers,a digester having an exhaust pipe extendingfrom the upper end thereof, a cooling box forming a bypass insaid'exhaust pipe under suitable valve control, a reclaiming tankconnected to the exhaust from said digester, a mixing box forming anintermediary member between saidweak liquor tower and said reclaimingtank on the one hand and said strong liquor tower and said reclaii'ningtank on the other hand, means for forcing the heated mixture from saidmixing box to said strong liquor tower, and means for drawing the liquorfrom said strong liquor tower to said reclaiming tank.

4. In means for producing acid liquor in sulphite pulp processes, aprimary producer, an intermediary mixing chamber receiving the dischargefrom said primary producer, a secondary producer receiving the dischargefromsaid intermediary chamber, a reclaiming tank feeding saidintermediary chamber and receiving the discharge from said sec ondaryproducer and a digester exhausting into said reclaiming tank.

In means for producing acid liquor in sulphite pulp processes, a weakacid tower and a strong acid tower, said strong acid tower having anexhaust gas connection leading to the lower end of said weak acid tower,an intermediary member forming the liquor connection between saidtowers, a digester and intercommunircvating means furnishing theheatt'rom the exhaust of the digester to said intermediary member.

6. In means for producing acid liquor in sulphite pulp processes, a weakacid tower and a strong acid tower having a gas connection, a digester,a tank common to the exhaust of said dig-ester and the discharge of saidstrong tower, and means connecting said common tank and said weak towerin cluding mixing chamber.

Signed at New York, N. Y., U. A., this 13th day of January 1925.

JACOB DARRE JENSSEN.

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